I definitely think Jack would be a good man to have around in a crisis! I mean the Doctor is awesome and a sexy bitch, but I think his twisty faces might scare me even more than the monsters he was making them at. It wouldn't exactly inspire confidence, would it? Unless you took the point of view of 'oh, it's the twisty face! This always comes right before he smacks a bitch with science and snappy dialogue!'